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Makita HM1242C Technical Information
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Makita HM1242C Technical Information

Makita HM1242C Technical Information

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T
ECHNICAL INFORMATION
Models No.
Description
C
ONCEPTION AND MAIN APPLICATIONS
HM1242C is the 10 Kg class hammer for BOSCH shank type
hammer bits (3/4" Hex 21/32 Round shank)
This model is taking over the existing HM1202C's benefits
in incredibly low noise, compact body and the strongest
demolishing power in this class.
S
pecification
Voltage (V)
100
115
120
220
230
240
Bit-type
Blows per minute
Net Weight
Size of shank
Cord Length
S
tandard equipment
Grease for bit ........... 1 pc.
< Note > The standard equipment for the tool shown may be differ from country to country.
O
ptional accessories
Bull point 19-300
Bull point 19-450
Cold chisel 26-300
Cold chisel 26-450
Scaling chisel 50-300
HM1242C
Demolition Hammer
Current (A)
Cycle (Hz)
15
50 / 60
15
50 / 60
13
50 / 60
7.3
50 / 60
7.0
50 / 60
6.7
50 / 60
BOSCH shank type
hammer bits
950-1,900 (bpm)
9.3kg (20.5 lbs)
(3/4" Hex 21/32 Round shank)
5m (16.4 ft)
Continuous Rating (W)
Input
1,450
1,450
1,450
1,450
1,450
1,450
Grooving chisel 22-300
Grooving chisel 26-300
Clay spade 105-400
Rammer 140
Bushing tool 67-300
PRODUCT
112mm(4-3/8")
Max. Output(W)
Output
1,600
500
500
1,600
500
1,600
550
1,800
550
1,800
550
1,800
P 1/ 12

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Summary of Contents for Makita HM1242C

  • Page 1 Demolition Hammer Description ONCEPTION AND MAIN APPLICATIONS HM1242C is the 10 Kg class hammer for BOSCH shank type hammer bits (3/4" Hex 21/32 Round shank) This model is taking over the existing HM1202C's benefits in incredibly low noise, compact body and the strongest demolishing power in this class.
  • Page 2 P 2 / 12 epair Screwdriver <1> Removing armature (1) Take off the rear cover from the motor housing by loosening 2 pcs.of tapping screw M4x18. And then take off the carbon brushes after taking off the brush holder cap. Brush Holder Cap Fig.1 Tapping screw M4x18...
  • Page 3 P 3 / 12 epair (5) Removing ball bearing 6304LLU from crank shaft. Insert the repairing jig 1R234, 1R240 and 1R241 into the arbor on the crank shaft as per the following illustration. And then, press with arbor press. So, Ball bearing 6304LLU can be removed. Arbor press 1R032 - 1R037 1R234...
  • Page 4 P 4 / 12 Cut of tool epair No.1R212 holder cover (2) Pulling tool holder cover down in the direction of the motor housing, slide the cut of ring spring 29 in the direction of the cut of tool holder cover. And expand the cut of ring spring 29 with, repairing tool No.1R212, lifting it with driver as illustrated in Fig.8.

  • Page 5: Tool Holder

    P 5 / 12 epair (3) Hold cylinder liner 44 with hand and strike crank housing with plastic or wooden hammer. Cylinder liner 44 Then the cylinder liner 44 can be removed from the machine. Crank housing (Assembling) (1) Assemble slide sleeve 49, ring 49 and Fig.12 compression spring 50 to cylinder liner 44.
  • Page 6 P 6 / 12 epair (Assembling) Urethane ring 43 (1) Assemble tool holder to barrel after inserting impact bolt as illustrated in Fig.16. Barrel O ring 38 Tool holder Impact bolt ( Note ) Make sure, that urethane ring 43 and O ring 38 are assembled to tool holder in advance.
  • Page 7 P 7 / 12 epair < 6> Mounting of barrel Take off only handle, not remove controller cover. (1) Set the of the guide ring on the of flat washer 49. Mount the above guide ring and flat washer 49 on the 3 prongs of slide sleeve 49.
  • Page 8 (5) Wipe up the grease in the crank housing Crank Cap with cloth. And then, apply fresh MAKITA grease No.00 by 30g. Crank Housing < Remarks > The fresh grease to be applied has to be limited to 30 g.
  • Page 9 P 9 / 12 epair * The parts to be greased with MAKITA grease No.OO. Put grease on the following parts in order to protect parts and machine from unusual abrasion and overheating. Fluoride ring 28 O ring23 Striker Impact bolt...
  • Page 10 P 10 / 12 epair < 9 > Maintenance It is recommended to change carbon brush every 140 hours operation. When changing carbon brush, we recommend you to change the following parts together. * Grease in crank housing. Apply fresh grease approx. by 30g. ( See P 10 / 14. ) * Urethane ring 43 and roller 12 to be assembled to (32) tool holder * Fluoride ring 28 and O ring 23 to be assembled to (36) impact bolt Urethane ring 43...

  • Page 11: Circuit Diagram

    P 11 / 12 ircuit diagram This terminal is to be Black connected to brush holder mounted on opposite side Brush holder on control dial side of control dial. > Black White White Tube Black Controller Switch Power supply cord Black Pick up coil Fig.26...
  • Page 12 P 12 / 12 iring diagram Lead wire from field (Black) and (White) has to be fixed by lead holder as per the illustration. F2. White F1.Black Lead wires of pick up coil have to be passed through rib B. At this time these 2 lead wires have not Rib B to be crossed each other.